
The picture shows a standard NC
(spring to closed) valve.
Exhaust air
Exhaust air
IN
air
Sensor 2
“Valve open”
Sensor 3
“Valve closed”
1
2
3
4
5
6
10
11
12
sol. 1
sol. 2
sol. 3
7
8
4. Mechanics and Pneumatics
4.4.5. CU43-D4 AS-interface für DA4 / D4 SL double seat mix proof
valves
Functional description - block diagram
M1
M2
M1 - magnet upper shaft
M2 - magnet lower shaft
5 VDC
Sensor 1
GND
5 VDC
Sensor 2
GND
Normal
Reverse
Feedback
AS-i-Bus +
AS-i-Bus -
seat lift cylinde
r
lower valve seat
main cylinder and integrated seat lift cylinde
r
upper valve seat
APV_CU4 AS-i_UK-5_072018.indd
UK
Control Unit
CU4 AS-interface
Instruction manual: UK - rev. 5
APV
16